/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.wwdablu.soumya.lottiebottomnav.util;

import ohos.agp.window.service.Display;
import ohos.agp.window.service.DisplayAttributes;
import ohos.agp.window.service.DisplayManager;
import ohos.app.Context;

import java.util.Optional;

/**
 * Util
 *
 * @since 2021-05-26
 */
public final class Util {
    private Util() {
    }

    /**
     * 获取屏幕密度
     *
     * @param context context
     * @return DisplayAttributes
     */
    public static DisplayAttributes getScreenPiex(Context context) {
        Optional<Display> display = DisplayManager.getInstance().getDefaultDisplay(context);
        DisplayAttributes displayAttributes = null;
        if (display.isPresent()) {
            displayAttributes = display.get().getAttributes();
        }
        return displayAttributes;
    }

    /**
     * dip2px转换
     *
     * @param context context
     * @param dpValue dpValue
     * @return float
     */
    public static float dip2px(Context context, float dpValue) {
        DisplayAttributes displayAttributes = getScreenPiex(context);
        return dpValue * displayAttributes.scalDensity;
    }

    /**
     * Returns true if the string is null or 0-length.
     *
     * @param str the string to be examined
     * @return true if str is null or zero length
     */
    public static boolean isEmpty(String str) {
        return str == null || str.length() == 0;
    }
}
